Railway truck



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Dec. 16, 1952 F'lled Jan 5. 1947 Dec. 16, 1952 Filed Jan. 5. 1947 Fig.3.

D. s. BARROWS RAILWAY TRUCK 2 SHEETSSHEET 2 3 rw rm tom Donald A.Barmws.

Patented Dec. 16, 1952 UNITED STATES PATENT OFFICE RAILWAY TRUCKDonald-S2- Barrows, Rochester," N; Y., assignor to The Symington-G'ouldCorporation;-- Depew,- N. Y., a corporation of Maryland ApplicationJanuary 3, 1947, Serial No.'720,068

31 Claims. 1

This invention pertains'to a railway truck and more particularly .to'the structure in or adjacent tothe windowopening of a side framethereof. An object of the invention is the provision, in

an improved railway'truck', of abolster movable vertically andtransversely relative to a side frame with'both of said'movementssnubbed by! tical movement and to 'befrictionally engaged thereby duringa transverse mvement.

The above and numerous other as Well as more-detailed objects of theinvention will become apparent upon a reviewofthe succeeding descriptionand the accompanying drawings, wherein:

Figure 1 is-a partial front elevational and partial vertical sectionalview ofa railway truck embodying a' form of the present invention:

Figure 2 is a'partial plan and'partial horizontal sectional viewtakenalong the-lines 2- -2 of Fig-' ure'l, looking in the directionofthearrows;

Figure 3 is a' transverse and vertical sectional view taken along thelines 3-4 of Figurel, lookring in thedirection of the arrows.

Figure 4 is a vertical sectional view taken along the 'lines 4--4-ofFigure 1, looking in the'direction of the arrows.

Referring now in detail to the variousfigures of the drawings, whereinlike reference characters indicate like parts, the numeral l isemployed, in a somewhat general manner, to indicate a railway-truck,preferably of 5 the four wheel type: Only a portion at or adjacent to a'center andone side-"of the truck is illustrated since the undisclosedportion is -'of no'present moment and mayyif desired, be of conventionalform. The" railway truck comprises a side frame 2, only'a central area:of which is shown since'itwill' be understood by those skilled in theart to which this invention pertains that a railway truckpf the-classherein considered comprises twoside frames, oneat each side of thetruck, forming structural members for connecting integral orseparate'fiournalboxes (not shown) and trans* mittingloads thereto;- Theside *framecomprises a top 'm compression member '3 spaced vertically 2from a lower or tension member 4'bo'th of which are'"joined intermediatetheir ends by longitudinally spaced, vertically extending columns 5 topresent or define a window opening 6 therebetween; The compressionmember is somewhat conventional in transverse section in that itcomprises a top web 311 having laterally spaced flanges 3bdepending'therefrom. The lower free edgesof the flanges are joined byconnecting a rib'3c. The 'tension'member is also of some-' whatconventional formin that its central horizontal portion comprises anupper web or bottom spring seat forming member 4a extended laterally ofthe side frame beyond the normal limits thereof to present an adequatebearing area for the accommodation of a nest of coil springs 1 (showndiagrammatically). Spaced a suitable distance below the spring seatforming member is a lower web 4b of less horizontal extent than itscompanion upper web and joined thereto by suitable side flanges 40. Thecentral portion of the tension member extends horizontallysubstantiallybetween the columns from'which locations they are directedupwardly as at 4d where,

conventionally, they join (not shown) with the compression member. Alsocharacteristically of sometypes' of side frames the bottom spring seatformingwmember has, upstanding from lateral edges thereof, reinforcingflanges 4e which ex-' tend along the central horizontal portion to mergewith the columns and upwardly directed parts 4d; Finally, so far as thetension member is concerned, it will be observed that the upwardIydirected parts are of double truss design with the top trusses 4gthereof cutting diagonally across the lowercorners of the window openingto merge with the bottom spring seat member at a spaced location removedfrom the related columns (see Figure 1) Each guide column comprises avertical" transverse web"5a which at its upper end blends intocompression member ribs 30 and its lower end merges withthe top truss 4gof the tension-member: Ea'chcolumn transverse web has outstandingtherefromtransversely spaced flanges 5b di-' rected longitudinally ofthe truck toward arelated end thereofand' merging at its respective zlyin'di'cated' in Figure 1 of the drawings.-

As'previously" stated, the central portion of thetension memberfunctions additionally -'as a supporting area for a nest or group ofconven tional 1 coil" springs indicated diagrammatically as at I;

Thegroup of springs function as a' yieldable support for a bolster 8,the latter of which extends between the related side frames as a loadtransmitting member and has an end 9 thereof disposed within the sideframe window or opening 5. As will be appreciated, the truck proceedingalong supporting rails will have its wheels passing over contiguous endsof rails, cross overs, switches, etc., which will cause the wheels tomove vertically because of the differences in elevations of supportingsurfaces at these locations. Also it may be observed that road beds aresomewhat yieldable in character and thus a very slight vertical weavingaction will be imparted to supporting rails as the truck passesthereover or therealong. Because of these recognized irregularities inthe supporting rails the respective side frames of the truck willexecute an action or motion akin to that of a hobby horse or rockingchair. In order to prevent the transmission of the natural hobby horseaction of the side frame to the bolster it is to be here noted that thebolster is made up as a composite structure comprising, generally, amain bolster member 8 and an equalizing member, end plate, top springplate or chair Hi positioned below and preferably in direct supportingrelation with each bolster extremity 9.

The chair is arranged within the window opening and has a main plate orWeb i i disposed substantially horizontally and positioned intermediatethe height of the chair. A lower face or surface [2 of the web bearsupon the subjacent nest of springs and extending downwardly from the webare laterally spaced vertical flanges l3 which reinforce the chair andprevent an unwarranted or accidental transverse displacement of theupper extremities of the springs forming the nest. The upwardly facingportion of the web is formed in part by a concave, cylindrical orarcuate, cradle forming surface it which terminates short of thehorizontal limits of the web and is disposed in a substantiallycentralized position with the radius of curvature lying on a medial lineor in a transverse vertical plane of the truck as indicated by thediagrammatic line A-A and as shown only in Figure l of the drawings. Abottom wall l5 of the bolster end is also provided with a cylindrical,curved or arcuate surface [6 but this latter surface is convex incharacter and desirably of a radius different than, but preferablyshorter than that of the plate surface M. The surface i6 is struck fromthe same medial line AA and thus only a limited area of the bearing,arcuate surfaces i4 and is will be in engagement with one another andwhen the components of the truck are in their normal or illustratedpositions this limited area of contact will be at or adjacent to thetransverse medial line of the truck to allow the side frame and othercomponents, inclusive of the chairs to rock in either directions andfreely beneath a bolster end without imparting any of such movements tothe bolster proper.

Means has been incorporated in the composite bolster structure tomaintain the related components in a predetermined relationship and thusprevent a shifting action of one arcuate surface relative to anotherarcuate surface. In other words, aside from a desired relative rockingmovement between the bolster proper and chairs it is preferred to havethese elements move vertically and transversely in unison as a single orunitary bolster structure, for, among other reasons quite apparent, toassure a proper disposition of the cylindrical surfaces [4 and I6.Toward the accomplishment of the above the chair intermediate web isprovided with a series of outer teeth ll disposed in series or alignmentlongitudinally of the truck and positioned outwardly of the truck frombut adjacent to the concave surface. The outer teeth are arranged as asegment of a gear and accordingly have the pitch circle thereofcoincident with the related concave surface. The bottom wall i5 of thebolster is provided with a series of downwardly extending, outer teethi3 also arranged as a segment of a gear and having a pitch circlecoincident with the related bolster convex surface It and being arrangedto mesh with the chair outer teeth. Disposed inwardly of the truck frombut adjacent to the chair concave surface is a second or inner row ofteeth Ila extending upwardly from the chair web and formed ascounterparts of the chair outer teeth. To facilitate the manufacture ofthe bolster the bottom wall thereof adjacent to the inner limits of theconvex surface is indented or recessed as at it. A separate segment of agear 28 is disposed within the recess and is welded or otherwise securedto the bolster bottom wall. The gear segment 2% has downwardly extendinginner teeth 21 meshing with the chair inner teeth and are substantiallycounterparts of the bolster outer teeth. It will be noted therefore thatthe intermeshing bolster and chair teeth maintain the cylindricalsurfaces in a predetermined or fixed relationship and also prevent thebolster from assuming a horizontal angular posi tion relative to itssupporting associated chairs. Studs or posts 22 upstand from the chairthrough suitable apertures in the bolster bottom wall with keys orcotters 23 passing through the posts within the bolster. Thisconstruction prevents an accidental separation of the components formingthe composite bolster structure.

From the description hereinabove set forth of the illustratedexemplification of the invention it will be noted that the arrangementforms a quick wheel change truck. In this regard it is to be notedfurther that upon a removal of the cotters 23 the bolster proper iselevated to a position where the bottom wall of the bolster clears theposts 22 and thereafter the side frame may be moved laterally away fromthe bolster end 9.

Since it is preferred to employ a group of all coil springs for thesupport of the composite bolster structure for reasons which areobvious, snubbing or friction creating means are incorporated in thetruck structure to control or dampen out vibratory actions of the group.With this thought in mind each column is provided with transverselyspaced, auxiliary flanges 24 which are vertically directed and extend ina direction toward the transverse medial line of the truck. Theseauxiliary flanges are formed integrally with the column webs insubstantial alignment with their companion flanges 5b and the auxiliaryflanges on each column are inclined or sloped transversely orlongitudinally of the truck. This auxiliary flange arrangement, thereason for which will be hereinafter made apparent, presents a taperedor somewhat bell-mouthed housin exposed toward the center of the sideframe and communicating with the bolster or window opening. So as toreinforce the auxiliary flanges against stresses to which they will besubjected in service, each auxiliary flange, which it might be herenoted extends vertically for only a lower part of the full height of arelated column, has its free end or edge provided with a verticallyextending, terminal web 25 directed transversely and outwardly of theside frame. The terminal webrof each auxiliary. flange merges at its:lower extremity; into the tension .member .whileat. its:

upperz:extremity it extends across the-column flangesgbto be formedintegral .witha related auxiliary flange. The-longitudinal .endsof thechair "web I I are formed integrally withvertical endgwalls28 whichextend transversely: of they truck:beyondthe-horizontal limits of theterminal;

structure. This somewhatfiexible connection. between the :bolsterstructure and. side frame is preferred in the instant embodiment of theinventionsothattany lateral impulsestimparted to the' side frame duringservice movement thereof will not be transmitted tothe bolster:

Confined.zwithin. each 1 housing defined by a columniweb; columnauxiliary flanges' and chair endxwalhare .a plurality; prefe'rablya pairof counter -p'art shoes :29 .each having a longitudinallyt'diagonal andvertically extending rubbing surface 230:.maintained, at all times, inintimate contact .with a correspondingly disposed rubbing surface 3|carried by the adjacent column auxil iary'fiange. The shoes of each pairare'urgedapart :transversely of the truck by any type of compressible orresilient means which, in the instant structure; is characterized by asingle coil or? helical compression. spring 32. Verticallyspaceditransversely and horizontally extending arms 33 are formed oneach shoe with the arms having angularly disposed fingers 34 at theirterminals; The fingers of related shoes are spaced from one another soasto allowa breathings'actionv of theshoes and more particularly toprevent the friction means, inclusive of the shoes and. interposedspring. from exploding upon the removal thereof fromthe side frame. Eacharm side: wall. has: outstanding therefrom vertically spaced shelves orledges 35 formed integral therewith: and; xtendingihorizontally into arelated column-with. adequate-space of clearance =th'ereabout :So as tonot interfere'wi-th the column. The; chair fshelves have surfaces 36 ifacingone another and arranged to: contact crowned or 'con-' vexsurfaces. :31 on the shoe arms thereby l being arranged to move theshoes vertically during any service flexures of the spring group andalso-allow* a transverse or tilting action of the side'frame andfriction means without disturbing'the normal transverse position of thebolster and its supporting chairs. Any movement of the chair in avertical direction will,. therefore, be reflected ina. correspondingmovement. "of the friction shoes and a relative movement of the rubbingsurfaces and, 3| the latter of which will snub, check or dampen outvibratory-actions of thespring 'nest."

As noted by referringparti'cularly' to Figure 4 of-the drawings, thehelical compression spring 32 is so arranged or disposed that its axisextends diagonally and transversely of the truck with itsends bearingagainst normally positioned spring seats -38. Such a disposition of'theheli calv compressionspring results intthetshoes of a pair beingurged vertically in opposite directions. to result inone shoe .beingpressed up-- wardly against a related shelf and the compan' ion shoebeing urged downwardly against a related shelf to prevent the shoes andshelves from setting up any, chattering; during service ..-move=mentsthereofits previouslysetforth there are,inthe-bolster;-.75:Drovided with. aawindow opening defined b'y co1- sideframe connection: provisions; for: relative transverse movementstherebetween and inorder to check'r'or "control :these movements. each"side wall of the tchair carries :an outwardly exposed:- brushing.surface .39 which extends verticallyxand;

transverselyrof the'truck: Due :to the particular disposition of therubbing surfaces; the shoes will.

be urged'outwardly of the columns andaccording-r ly;.each shoe carriesan" outwardly exposedsplane-r surface: 40 arranged to bear against .a-:related brushingi surface so that frictional forces willbe created;thereon: during any relative transverse or tilting movements of theside'frame and chair:-

orbolster;

In: order to partially shieldthe friction means against the entrancethereinto of dirt onother:

abrasive particlesxeach bolster side wallaj lis provided; with anoutstanding" hoodelike member fl madeupjtof a.:top Wall .43-'overlyingithe fric' tion: means. intzvertical spaced .relation.theretoandextending longitudinally of the truck towardthe ;related Jcolumn 1 web' but terminating short thereof to allow for normal servicemovements of the bolster proper. Each topiwall extends transversely. ofthe truck.. a. predetermined distance where. it merges with a relatedvertically directed end wall.44.1 From the above .it will be notedthatvarious changesand alterations may be made to theili with: a side:fram having columns defining ia window opening 1' with a bolster rendositioned in the opening, a nest of springs carried by-said side framewithinsaid opening, a chair mounted on said.:nest of springs and havingvertically spaced ledgesextending into said columns,'verti cal surfacescarriedby said chair, friction means movable vertically by said ledgesand arranged to engage frictionally said columns and chairverticalsurfaces, and engaging rocker surfaces carried by said bolster andchair.

2. In a railway truck wherein aside frame isrprovided'with arwindowopening definedby columns and. .a bolster "end is positioned within the=opening,the combination of, a spring sup:-

, ported .chair within said opening and having ver-' tically' spaced.flanges extending into" said col-'- umns-,:fric.tion means movablevertically by'saidchairrflanges for frictionally engaging said col-'umns,.- andzcontacting' arcuate surfaces of (iiiferent .radiion saidbolster and'chair' for al-' lowing said chair to rock longitudinally ofsaidtruck. beneath said bolster.

3. vInairailway truck wherein a side frame-is provided with awindowopening defined by columns and a bolster end is positionedwithin'the opening; the combination of, a spring supported chair withinsaid opening and having vertically spaced-ledgesextending into saidcolumns, said" chair being arranged to move vertically and transverselyof said 'side' frame, friction means with.-

in said columns and movable verticallyby said.

umns and a bolster end is positioned within the opening, the combinationof, a spring supported chair within said opening and having verticallyspaced longitudinally extending shelves disposed in said columns,vertical surfaces on said chair within said opening, transverselyspreadable friction means disposed between and movable vertically bysaid shelves, said chair being movable vertically and transverselyrelative to said side frame, said friction means being so arranged andconstructed as to frictionally engage said columns and chair verticalsurfaces for snubbin all of said movements of said chair, and engagin'garcuate surfaces on said chair and bolster for allowing a rocking actionbetween said bolster and chair.

"5. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening, vertically spaced shelves on said chair and extending into said001- umns, transversely spreadable friction means within said columnsand movable vertically by said shelves for frictionally engaging saidcolumns, inclined surfaces on said columns and friction means fordirecting said friction means toward said opening into engagement withsaid chair, and arcuate surfaces of different radii on said bolster andchair for allowing a relative rocking motion between said chair andbolster.

6. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and carrying said bolster end, outstanding ledges at thevertical limits of said chair and extending into said col umns, frictionmeans spreadable transversely of said truck into engagement with saidcolumns, said friction means being movable vertically by said chairledges, a concave surface on said chair, and a bolster carried convexsurface of different radius than and bearing upon said chair concavesurface.

7. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and carrying said bolster end, substantially paralleloutstanding ledges at the vertical limits of said chair, friction meansWithin said columns and spreadable transversely into frictionalengagement with said columns, said friction means being movablevertically by said ledges, a concave surface on said chair intermediatethe height thereof, and a bolster associated convex surface of differentcurvature than and bearing upon said chair concave surface;

8. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and supporting said bolster end, substantially paralleloutstanding ledges at the vertical limits of said chair and extendinginto said columns, substantially vertical surfaces carried by said chairbetween said ledges, said chair being arranged to move vertically andtransversely relative to said side frame, and friction means movablevertically by said chair ledges; said friction means being arranged toengage said columns and chair surfaces for snubbing all of said chairmovements.

9. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and supporting said bolster end, substantially paralleloutstanding ledges adjacent the vertical limits of said chair andextending into said columns, substantially vertical surfaces carried bysaid chair between said ledges, said chair being arranged to movevertically and transversely relative to said side frame, friction shoesSpring pressed transversely and movable vertically by said chair ledges,said shoes being arranged to engage frictionally said columns and chairsurfaces for snubbing relative movements between said chair and sideframe, and means on said chair for limiting said chair transversemovements.

10. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening, substantially parallel outstanding ledges adjacent the verticallimits of said chair and extending into said columns, friction shoesmovable vertically by said ledges and spring pressed transversely intofrictional engagement with said columns, a cylindrically disposedsurface on said chair intermediate the height thereof, a cylindricallydisposed surface on said bolster bearing upon and of different curvaturethan said chair cylindrically disposed surface, and means on said chairand bolster for preventing relative horizontal angular movementtherebetween.

11. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and having spaced transverse vertical surfaces adjacent saidcolumns, said chair being arranged to move transversely relative to saidside frame, vertically spaced ledges extending into said columns fromadjacent the vertical limits of said vertical surfaces, spring pressedshoes within said columns movable vertically by said ledges and arrangedto engage frictionally said columns and chai surfaces,'an arcuatesurface intermediate the height of said chair, and an arcuate surface onsaid bolster in engagement with said chair arcuate surface.

12. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening, said chair being arranged to move transversely and verticallyrelative to said side frame, vertically spaced ledges extendin into saidcolumns from said chair, spring pressed shoes within said columns andbetween said ledges and arranged to be moved vertically by said ledges,said columns and shoes being arranged to direct said shoes into intimatecontact with said columns and toward said opening against said chair forsnubbingboth of said chair movements, rocker means formed on said chairand bolster, and interlocking means formed on said chair and bolster forholding said rocker means in a predetermined relationship.

13. In a chair for use between columns of a side frame, the combinationof, a web disposed intermediate the height of said chair, vertical endfriction walls spaced apart and extending above and below said'web andarranged to be positioned standing from adjacent the vertical limits ofsaid wall in a direction away from said web, and a rack adjacent saidconcave surface.

15. In a chair for use between columns of a side frame, the combinationof, a web disposed intermediate the height of said chair, verticallydisposed end friction walls spaced apart and extending above and belowsaid web and arranged to be positioned between and adjacent to saidcoumns, a friction surface carried by said end walls for constantengagement by a friction means, and vertically spaced substantiallyhorizontal ledges outstanding from said side Walls in a direction awayfrom said web.

16. In a chair for use between columns of a side frame, the combinationof, a web disposed intermediate the height of said chair and having adownwardly facing spring seat and upwardly facin bolster seat, verticalwalls on said web at sides thereof and extending above and below saidseats, outwardly facing surfaces on said walls for constant engagementby friction means, and vertically spaced friction means engaging ledgesoutstanding from each wall.

17. In a railway truck wherein a side frame is provided with a windowopening and a bolster end is positioned within the opening, thecombination of, columns in said side frame having portions extendinginwardly of and outwardly from said window opening, said columns havingintermediate webs between said portions and extending transversely ofsaid truck beyond said portions, a top sprin plate within said openingarranged to move vertically and transversely of said side frame,friction means within and engaging said inwardly extending columnportions and said top spring plate, means on said top spring plate formoving said friction means upwardly and downwardly, and hood means onsaid bolster overlying said friction means and inwardly extending columnportions.

18. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported top plate within saidopening and directly supporting said bolster, horizontal ledgesoutstanding from said top plate and extendin into said columns, shoeswithin said columns and movable upwardly and downwardly by said ledges,and diagonally disposed spring means urging said shoes transversely ofsaid truck into frictional engagement with said columns.

19. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported top plate within saidopening, said top plate normally contacting said bolster adjacent atransverse medial line only of said truck, shelves outstanding into saidcolumns from said top plate above and below said bolster-top platecontact,

, 10 interlocked friction shoes within each column and being movableupwardly and downwardly by said shelves, and spring means disposeddiagonally and urging said shoes into frictional engagement with saidcolumns.

20. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported top plate within saidopening, said top plate normally contacting said bolster adjacent atransverse medial line only of said truck, shelves outstandinginto saidcolumns from said top plate above and below said bolster-top platecontact, said top plate being arranged to move vertically andtransversely of said truck, outwardly exposed surfaces on said top plateadjacent said columns, interlocked friction shoes within each column andmovable vertically by said shelves, spring means acting against saidshoes for urging them into frictional engagement with said columns andtop plate surfaces to snub all movements of said top plate, and meansconnecting said bolster and top plate thereby causing'said bolster andtop plate to move vertically and horizontally in unison.

21. A railway truck comprising in combination with a side frame havingcolumns defining a window opening with a bolster end positioned in saidopening, a nest of springs carried by said side frame within saidopening, a chair mounted on said nest of springs and having verticallyspaced ledges extending into said columns, friction means .carried bysaid ledges and arranged to frictionally engage said columns and chairintermediate said ledges, contacting rocker surfaces on said bolster andchair, and interlocking teeth on said bolster and chair for preventingangular relative displacement between said bolster and chair.

22. In a bolster having an end arranged to extend into a window openingof a side frame, the combination of, a lower convex surface on saidbolster end, racks arranged on an arc at each side of said convexsurface, and hoods outstanding from sides of said bolster end.

23. In a bolster having an end arranged to extend into a window openingof a side frame, the combination of, a lower convex surface on saidbolster end, sets of teeth arranged on an are at each side of saidconvex surface, one of said sets of teeth being formed separately andsecured to said bolster end.

24. In a bolster having an end arranged to extend into a window openingof a side frame, the combination of, a lower convex surface on saidbolster end, spaced sets of teeth arranged at sides of said convexsurface, one of said sets of teeth being formed separately and securedto said bolster end.

25. In a bolster having an end arranged to extend into a window openingof a side frame,

' the combination of, a lower convex surface on tend into a windowopening of a side frame, the

combination of,- a lower convex surface on said bolster end curvedtransversely of said bolster, means operatively related to and extendingdownwardly from said bolster end adjacent said convex surface; saidmeans being formed separately and secured to said bolster, and hoodsoutstanding from side walls of said bolster end.

27. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and having vertically spaced flanges extending into saidcolumns, friction means movable vertically by said chair flanges forfrictionally engaging said columns, contacting arcuate surfaces ofdifferent radii on said bolster and chair for allowing said chair torock longitudinally of said truck beneath said bolster, and means onsaid bolster and chair adjacent said arcuate surfaces for maintaining apredetermined relationship between said contacting arcuate surfaces.

28. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and having vertically spaced flanges extending into saidcolumns, friction means movable vertically by said chair flanges forfrictionally engaging said columns, contacting arcuate surfaces ofdifferent radii on said bolster and chair for allowing said chair torock longitudinally of said truck beneath said bolster, and curvedintermeshing teeth on said bolster and chair adjacent said arcuate surfaces for preventing said arcuate surfaces from angling horizontallyrelative to one another.

29. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and having vertically spaced flanges extending into saidcolumns, friction means movable vertically by said chair flanges forfrictionally engaging said columns, contacting arcuate surfaces ofdifferent radii on said bolster and chair for allowing said chair torock longitudinally of said truck beneath said bolster, and curvedintermeshing teeth on said bolster and chair adjacent said arcuatesurfaces; some of said teeth on said bolster being formed separately andsecured to said bolster.

30. In a railway truck wherein a side frame is provided with a windowopening defined by columns and a bolster end is positioned within theopening, the combination of, a spring supported chair within saidopening and having vertically spaced flanges extending into saidcolumns, friction means movable vertically by said chair flanges forfrictionally engaging said columns, contacting arcuate surfaces ofdifferent radii on said bolster and chair for allowing said chair torock longitudinally of said truck beneath said bolster, intermeshingmeans on said bolster and chair for preventing said arcuate surfacesfrom angling horizontally relative to one another, and hoods outstandingfrom said bolster covering said friction means.

31. In a railway truck wherein a side frame has a window opening, thecombination of a bolster member in said opening, a chair membersupporting said bolster member, an arcuate surface on one of saidmembers and contacting said other member for allowing said chair memberto rock relatively longitudinally of said side frame, and extendingbetween said members adjacent said surface for maintaining predeterminedrocking contact therebetween.

DONALD S. BARROW S.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 778,739 Buhoup Dec. 27, 1904809,595 I-Iopkin Jan. 9, 1905 1,141,436 Turner June 1, 1915 1,749,959Barrows -1 Dec. 17, 1929 1,910,992 Hedgcock M May 23, 1933 2,963,739Hedgcock et a1. 1 Dec. 8, 193? 2,125,275 Goodwin Aug. 2, 1938 2,277,263Tucker Mar. 24, 1942 2,282,166 Cottrell May 5, 1942 2,295,557 CottrellSept. 15, 1942 2,347,463 Couch Apr. 25, 1944 2,375,207 Cottrell May 8,1945 2,378,229 Light June 12, 1945

